- Companies
- Specialist contractors
- Construction Testing Services Ltd
Construction Testing Services Ltd
- Company number
- NI068341
- Incorporated
- 4 Mar 200818 years trading
- Registered office
- C/O DN Mawhinney & Co, Chartered Certified Accountants, Unit 4 Steeple Industrial Estate, Antrim, BT41 1AB
- Nature of business
- Other specialised construction activities n.e.c.
Construction Testing Services Ltd is a 18-year-old private limited company registered in Unit 4 Steeple Industrial Estate, company number NI068341, one of the UK's specialist construction companies. Companies House shows its accounts as overdue: they were due on 30 September 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £1,925 (-0.4%) on the year before, to £486K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £328K against £173K owed within a year: 1.9 times cover.
- 19 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £486K | £113K | £328K | £173K | 19 |
| 31 Mar 2024 | £487K | £91K | £312K | £154K | 19 |
| 31 Mar 2023 | £432K | £28K | £239K | £137K | 16 |
| 31 Mar 2022 | £443K | £112K | £319K | £190K | 17 |
| 31 Mar 2021 | £359K | £169K | £383K | £173K | 18 |
| 31 Mar 2020 | £306K | £100K | £275K | £119K | 20 |
| 31 Mar 2019 | £275K | £43K | £245K | £111K | |
| 31 Mar 2018 | £302K | £290K | £167K | ||
| 31 Mar 2017 | £278K | £115K | £304K | £144K | 25 |
| 31 Mar 2016 | £251K | £105K | £256K | £108K |
Where Construction Testing Services Ltd is registered
The registered office is in Unit 4 Steeple Industrial Estate (BT41), in the Antrim and Newtownabbey local authority area, Northern Ireland. Show BT41 1AB on a map.
Other trade companies in BT41
- Artlone Utilities LtdMachinery repair and installation
- LGC Contracts LtdBuilders
- GM Homes & Property LimitedProperty developers
- McCombe Construction LtdBuilders
- C.S.Spray.Worx LimitedPainters and decorators
- Cuttin An'trimmin LtdLandscapers and gardeners
- M3 Fitout LimitedInstallers
- PCR Property Developments LimitedBuilders
What happens if Construction Testing Services Ltd files late
If the accounts reach Companies House today, the late filing penalty is £150 (£300 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2026 to 31 Oct 2026 | £150 |
| 1 to 3 months late | 1 Nov 2026 to 31 Dec 2026 | £375 |
| 3 to 6 months late | 1 Jan 2027 to 31 Mar 2027 | £750 |
| More than 6 months late | From 1 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2027 | £200 |
| 3 months late | 31 Mar 2027 | another £200 |
| 6 months late | 30 Jun 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 2027 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- NI068341
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 March 2008 (18 years ago)
- Registered office
- C/O DN Mawhinney & Co, Chartered Certified Accountants, Unit 4 Steeple Industrial Estate, Antrim, BT41 1AB
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 4 March 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies
Other active specialist construction companies.
Frequently asked questions
When are Construction Testing Services Ltd's accounts due?
Construction Testing Services Ltd's accounts were due at Companies House on 30 September 2026 and the register shows them as overdue.
When is Construction Testing Services Ltd's CT600 due?
The CT600 for the period to 31 December 2025 is due at HMRC by 31 December 2026, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2026.
Is Construction Testing Services Ltd still trading?
Construction Testing Services Ltd is listed as active on the Companies House register (checked 12 Oct 2026). Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Construction Testing Services Ltd do?
Construction Testing Services Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Construction Testing Services Ltd?
Construction Testing Services Ltd was incorporated on 4 March 2008, 18 years ago.
What is the penalty if Construction Testing Services Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Construction Testing Services Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.